Courtesy of the Atlantic's Derek Thompson, a hilarious chart comparing the "dispersion" of different hypothetical monetary unions:
Thompson's own comment:
Compared across more than 100 factors measured by the World Economic Forum Global Competitiveness Report, from corruption to deficits, JP Morgan analyst Michael Cembalest calculates that the major countries on the euro are more different from each other than basically every random grab bag of nations there is, including: the make-believe reconstituted Ottoman Empire; all the English speaking Eastern and Southern African countries; and all countries on Earth at the 5th parallel north.
And here is your tweetable fact: A monetary union might make more sense for every nation starting with the letter "M" than it does for the euro zone.